RENNtech ECU Upgrade | C217 | S 550 Coupé | 500HP / 625LB-FT | 4.7L V8 BiTurbo | M278 | MY2015-2017 mercedes-benz-sl-class--232---2022-present--sl-43-amg-biturbo-esr7590087 Up to 549HP and 495TQ

Up to 549HP and 495TQ

Weighs only 11

Stainless Steel Downpipes: Made out of from 304 High-Strength Stainless Steel and are equipped with 200 Cell Sport Catalytic Converters downpipes improve performance

The RENNtech ECU Upgrade brings the C 43 AMG Coupe up to 400 HP and 440 LB-FT | Gains: +25 HP and +42 LB-FT

0" Weight:   Construction: 1-piece Forged Tire Size: 275/30-19

RENNtech ECU Upgrade | C217 | S 550 Coupé | 500HP / 625LB-FT | 4.7L V8 BiTurbo | M278 | MY2015-2017 mercedes-benz-sl-class--232---2022-present--sl-43-amg-biturbo-esr7590087 Up to 549HP and 495TQECU Upgrade 500HP 625LB FT Gains: +26HP +59LB FT Our intermediate level ECU upgrade for the Mercedes M278 engine still offers huge gains in performance across the entire RPM range, but with a slightly reduced peak HP and torque from our standard tune. This is ideal for customers who want increased performance in their daily driver without worry of extra strain on driveline components or for areas and countries with extreme altitudes, temperatures or